Process for the recovery of by-products from gases of fuels.



A', ROTTMANN PROCESS FOR THE RECOVERY OF BY-PKODUGTS PROM GASES 0FFUELS. APPLICATION FILED JULY 5. 1913'.

Patented May 13, 1913.

UNITED sTATEs PATENT OFFICE.

AUGUST ROTTHANN, -OI! BOCHUM, GEBHANY, ASSIGNOB TO THE FIRM OF DB. 0.OTTO 8t COMP. GES. HIT BESCHBKNKTEB EA'FTUNG, OF BOCHUH, GERMANY.

PROCESS FOR THE RECOVERY OF BY PRODUOTS FROM GASES OF FUELS.

Specification of Letters Patent.

Patented May 13, 1913.

' fication.

The object of m invention is to recover tar and ammonia om distillationgases in a novel.and more wonomical way than before and consists inreloading the-gases with the greater part of the water, which iscondensed with the separation of the tar; the reheating of the condensedwater is effected the heat of the raw gases and the process t ecirculating liquor is enriched in fixed ammonia-salts and its amount -iscomparatively very small and highly concentrated and'its distillationwith lime therefore requires very little steam. The fixed salts also maybe recovered directly from the circulating iquor b evaporation-of thestrongly concentrate liquor.

Suitable apparatus for carrying out this rocess is shown on the drawing,which orms art of the specification.

The ot distillation gases enter the cooler 6 through a pipe a, thecooling liquid being provided through pi e c,- the condensate from thegas leaves t e cooler by means of the sealed tar pot d. The coolingliquid is part of the condensate, recovered in a later period of theprocess; it is separated from the tar in the tar separator e and theliquor is brought to the required tem erature in cooler f and forced; tothe cooler by means of the pump 9 and pressure pipe 0. From the cooler12 the gas is sucked b .the exhauster k and forced into the was erorregenerator i; the hot water coming from cooler I) through pipe ,k isinjected downward in the washer i against the ascending gas. In thewasher the cool gas is reheated and it takes up upon its way all thevolatile Application filed July 5, 1912. Serial No. 707,784.

ammonia and evaporates a great part of the fallin' water; the surplus ofthe washing liqui flows oil through tar pot Z to the se arator e and isused over and over again. ollowing the washer, the gas flows through atank m, in which water sprays are provided and itthen goes in asaturater n" through a bath of acidand all volatile ammonia is absorbed.Behind the saturater n the gas passes into a cooler o, in which more'orless of the water vapor in the gas is condensed according to thetemperature of the outflowing gas- By loading the gas in the washer zwith the greater part of the water, condensed in the preceding coolerand condensing the water vapor behind the saturater, there is left fordistillation only a small amount of concentrated liquor and thereforethe amount of obnoxious wast-c liquor is also very small. The condensatefrom the cooler o is a clean water and may be used for differentpurposes-for quenching coke or as a cooling water itself; this water maalso be evaporated on a. cooling tower an these vapors will have no badeffect on the surrounding vegetation.

I claim; a K Process for the recovery of by-products from distillationgases of fuels, which consists in cooling the raw distillation gases forthe condensation of tar, partof the ammonia, and steam, with acondensate from a later period of the process, which condensate iscooled and separated from its tar, then bringing the heated coolingliquid into intimate contact with the cooled gases thereby loading thegases with all the volatile ammonia and with the greater part of thecondensed water, and then passing the gases into a bath of acid.

"In testimony whereof I have signed this specification in the presenceof two subscribing witnesses.

AUGUST ROTTMANN. 1. s]

Witnesses: 4

ALBERT Norm, CHAS. J. WRIGHT.

